Determine hot blocks on interconnect

Question

Hi,
I got the below query from the forum...Re: How to determine hot blocks on interconnect and when i ran in my instance..
its show as
SQL> select /*+ rule */
de.owner, de.segment_name, de.segment_type,
  2    3  ash.event,
  4  sum(ash.time_waited) total_time,
  5  count(*) count,
  6  sum(ash.time_waited)/count(*) Avg_wait
  7  from
  8  V$ACTIVE_SESSION_HISTORY ash,
  9  dba_extents de
10  where
11  ash.event like 'gc%' and
12  ash.P1TEXT='file#' and
13  ash.P2TEXT='block#' and
14  ash.p1=de.file_id and
15  ash.time_waited > 0 and
16  ash.p2 between de.block_id AND (de.block_id+de.blocks-1)
17  group by de.owner, de.segment_name, de.segment_type, ash.event
18  order by 5 desc;
OWNER      SEGMENT_NAME                   SEGMENT_TYPE    EVENT                          TOTAL_TIME      COUNT   AVG_WAIT
APPLSYS    FND_CONCURRENT_REQUESTS        TABLE           gc buffer busy                 1093170590       1647  663734.42
APPLSYS    FND_CONCURRENT_REQUESTS_N2     INDEX           gc buffer busy                  308449809        379 813851.739
APPLSYS    FND_CONCURRENT_QUEUES          TABLE           gc buffer busy                   57052295         82 695759.695
GMI        IC_TRAN_PND                    TABLE           gc buffer busy                   20919444        590 35456.6847
SYS        _SYSSMU194$                    TYPE2 UNDO      gc buffer busy                    4866157          5   973231.4
WSH        WSH_DELIVERY_DETAILS           TABLE           gc cr multi block request         3691260         22 167784.545
APPLSYS    FND_CACHE_VERSIONS_PK1         INDEX           gc buffer busy                    3500004          4     875001
APPLSYS    FND_CONCURRENT_REQUESTS_U1     INDEX           gc buffer busy                    2894350          6 482391.667
APPLSYS    WF_ITEM_ACTIVITY_STATUSES_H    TABLE           gc buffer busy                    2769562         84 32970.9762Is this means these blocks are hot blocks...if so how do i resolve this...
thanks,
baskar.l

Answer 1

Hi,
Thanks rodrigo and all..i followed the URL and could find a fnd table where the size of the table is 1gb but number of blocks*rowlength is 44mb...created a backup table as select * from fnd table to see that the backup table size is 44mb only..
Will rebuilt this table on maintaence window..
thanks,
baskar.l